body{
    background: rgb(229, 253, 229);
    background: linear-gradient(90deg, rgb(230, 254, 229) 0%, rgb(220, 231, 255) 100%);
    /*min-height: 900px;*/
}

.container-fluid{
    margin-top: 75px;
}

.container-fluid .danmu_container{
    height:500px;
}

.danmu{
    color:white;
    position:fixed;
    /*原来是0,但是这样突然出现很突兀，所以向屏幕右外移动一下*/
    /*right:-500px;*/
    white-space: nowrap;
    background-color: #1b1b1b;
    padding: 6px 20px;
    border:  3px #FFFFFF solid;
    border-radius: 30px;
    font-weight: bold;
}